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Comment:Basic server functioning, responding to ping and login
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SHA1: eab23b866aa87d5f998b3d9ebae67bb5afbba3ec
User & Date: matt on 2014-11-23 20:56:49
Other Links: branch diff | manifest | tags
Context
2014-11-23
23:13
ping and login working check-in: 5f6b43d51b user: matt tags: try-nanomsg
20:56
Basic server functioning, responding to ping and login check-in: eab23b866a user: matt tags: try-nanomsg
18:14
Partial implementation. Not yet functional check-in: 120292c013 user: matt tags: try-nanomsg
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Modified api.scm from [0d03b6cbef] to [cd180ba59c].

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    login
    testmeta-get-record))

;; These are called by the server on recipt of /api calls
;;    - keep it simple, only return the actual result of the call, i.e. no meta info here
;;
(define (api:execute-requests dbstruct cmd params)

  (case (string->symbol cmd)
    ;; SERVERS
    ((start-server)                 (apply server:kind-run params))
    ((kill-server)                  (set! *server-run* #f))

    ;; KEYS
    ((get-key-val-pairs)            (apply db:get-key-val-pairs dbstruct params))
    ((get-keys)                     (db:get-keys dbstruct))

    ;; TESTS
    ((test-toplevel-num-items)         (apply db:test-toplevel-num-items dbstruct params))
    ((get-test-info-by-id)	       (apply db:get-test-info-by-id dbstruct params))
    ((test-get-rundir-from-test-id)    (apply db:test-get-rundir-from-test-id dbstruct params))
    ((test-set-state-status-by-id)     (apply db:test-set-state-status-by-id dbstruct params))
    ((get-count-tests-running)         (apply db:get-count-tests-running dbstruct params))
    ((get-count-tests-running-in-jobgroup) (apply db:get-count-tests-running-in-jobgroup dbstruct params))
    ((delete-test-records)             (apply db:delete-test-records dbstruct params))
    ;; ((delete-test-step-records)        (apply db:delete-test-step-records dbstruct params))
    ((delete-old-deleted-test-records) (apply db:delete-old-deleted-test-records dbstruct params))
    ((test-set-status-state)           (apply db:test-set-status-state dbstruct params))
    ((get-previous-test-run-record)    (apply db:get-previous-test-run-record dbstruct params))
    ((get-matching-previous-test-run-records)(apply db:get-matching-previous-test-run-records dbstruct params))
    ((test-get-logfile-info)           (apply db:test-get-logfile-info dbstruct params))
    ((test-get-records-for-index-file)  (apply db:test-get-records-for-index-file dbstruct params))
    ((get-testinfo-state-status)       (apply db:get-testinfo-state-status dbstruct params))
    ((test-set-top-process-pid)        (apply db:test-set-top-process-pid dbstruct params))
    ((test-get-top-process-pid)        (apply db:test-get-top-process-pid dbstruct params))
    ((test-get-paths-matching-keynames-target-new) (apply db:test-get-paths-matching-keynames-target-new dbstruct params))
    ((get-prereqs-not-met)             (apply db:get-prereqs-not-met dbstruct params))
    ((roll-up-pass-fail-counts)        (apply db:roll-up-pass-fail-counts dbstruct params))
    ((update-fail-pass-counts)         (apply db:general-call dbstruct 'update-pass-fail-counts params))
    ((get-count-tests-running-for-run-id) (apply db:get-count-tests-running-for-run-id dbstruct params))

    ;; RUNS
    ((get-run-info)                 (apply db:get-run-info dbstruct params))
    ((get-run-status)               (apply db:get-run-status dbstruct params))
    ((set-run-status)               (apply db:set-run-status dbstruct params))
    ((register-run)                 (apply db:register-run dbstruct params))
    ((set-tests-state-status)       (apply db:set-tests-state-status dbstruct params))
    ((get-tests-for-run)            (apply db:get-tests-for-run dbstruct params))
    ((get-test-id)                  (apply db:get-test-id dbstruct params))
    ((get-tests-for-runs-mindata)   (apply db:get-tests-for-runs-mindata dbstruct params))
    ((get-run-name-from-id)         (apply db:get-run-name-from-id dbstruct params))
    ((delete-run)                   (apply db:delete-run dbstruct params))
    ((get-runs)                     (apply db:get-runs dbstruct params))
    ((get-all-run-ids)              (db:get-all-run-ids dbstruct))
    ((get-prev-run-ids)             (apply db:get-prev-run-ids dbstruct params))
    ((get-run-ids-matching-target)  (apply db:get-run-ids-matching-target dbstruct params))
    ((get-runs-by-patt)             (apply db:get-runs-by-patt dbstruct params))
    ((lock/unlock-run)              (apply db:lock/unlock-run dbstruct params))
    ((update-run-event_time)        (apply db:update-run-event_time dbstruct params))
    ((find-and-mark-incomplete)     (apply db:find-and-mark-incomplete dbstruct params))

    ;; STEPS
    ((teststep-set-status!)         (apply db:teststep-set-status! dbstruct params))

    ;; TEST DATA
    ((test-data-rollup)             (apply db:test-data-rollup dbstruct params))
    ((csv->test-data)               (apply db:csv->test-data dbstruct params))
    ((get-steps-data)               (apply db:get-steps-data dbstruct params))

    ;; MISC
    ((login)                        (apply db:login dbstruct params))
    ((general-call)                 (let ((stmtname   (car params))
					  (run-id     (cadr params))
					  (realparams (cddr params)))
				      (db:with-db dbstruct run-id #t ;; these are all for modifying the db
						  (lambda (db)
						    (db:general-call db stmtname realparams)))))
    ((sync-inmem->db)               (db:sync-touched dbstruct run-id force-sync: #t))
    ((sdb-qry)                      (apply sdb:qry params))
    ((ping)                         (current-process-id))

    ;; TESTMETA
    ((testmeta-get-record)       (apply db:testmeta-get-record dbstruct params))
    ((testmeta-add-record)       (apply db:testmeta-add-record dbstruct params))
    ((testmeta-update-field)     (apply db:testmeta-update-field dbstruct params))


    (else
     (list "ERROR" 0))))

;; http-server  send-response
;;                 api:process-request
;;                    db:*
;;
;; NB// Runs on the server as part of the server loop
;;








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    login
    testmeta-get-record))

;; These are called by the server on recipt of /api calls
;;    - keep it simple, only return the actual result of the call, i.e. no meta info here
;;
(define (api:execute-requests dbstruct cmd params)
  (let ((res
	 (case (string->symbol cmd)
	   ;; SERVERS
	   ((start-server)                 (apply server:kind-run params))
	   ((kill-server)                  (set! *server-run* #f))

	   ;; KEYS
	   ((get-key-val-pairs)            (apply db:get-key-val-pairs dbstruct params))
	   ((get-keys)                     (db:get-keys dbstruct))

	   ;; TESTS
	   ((test-toplevel-num-items)         (apply db:test-toplevel-num-items dbstruct params))
	   ((get-test-info-by-id)	       (apply db:get-test-info-by-id dbstruct params))
	   ((test-get-rundir-from-test-id)    (apply db:test-get-rundir-from-test-id dbstruct params))
	   ((test-set-state-status-by-id)     (apply db:test-set-state-status-by-id dbstruct params))
	   ((get-count-tests-running)         (apply db:get-count-tests-running dbstruct params))
	   ((get-count-tests-running-in-jobgroup) (apply db:get-count-tests-running-in-jobgroup dbstruct params))
	   ((delete-test-records)             (apply db:delete-test-records dbstruct params))
	   ;; ((delete-test-step-records)        (apply db:delete-test-step-records dbstruct params))
	   ((delete-old-deleted-test-records) (apply db:delete-old-deleted-test-records dbstruct params))
	   ((test-set-status-state)           (apply db:test-set-status-state dbstruct params))
	   ((get-previous-test-run-record)    (apply db:get-previous-test-run-record dbstruct params))
	   ((get-matching-previous-test-run-records)(apply db:get-matching-previous-test-run-records dbstruct params))
	   ((test-get-logfile-info)           (apply db:test-get-logfile-info dbstruct params))
	   ((test-get-records-for-index-file)  (apply db:test-get-records-for-index-file dbstruct params))
	   ((get-testinfo-state-status)       (apply db:get-testinfo-state-status dbstruct params))
	   ((test-set-top-process-pid)        (apply db:test-set-top-process-pid dbstruct params))
	   ((test-get-top-process-pid)        (apply db:test-get-top-process-pid dbstruct params))
	   ((test-get-paths-matching-keynames-target-new) (apply db:test-get-paths-matching-keynames-target-new dbstruct params))
	   ((get-prereqs-not-met)             (apply db:get-prereqs-not-met dbstruct params))
	   ((roll-up-pass-fail-counts)        (apply db:roll-up-pass-fail-counts dbstruct params))
	   ((update-fail-pass-counts)         (apply db:general-call dbstruct 'update-pass-fail-counts params))
	   ((get-count-tests-running-for-run-id) (apply db:get-count-tests-running-for-run-id dbstruct params))

	   ;; RUNS
	   ((get-run-info)                 (apply db:get-run-info dbstruct params))
	   ((get-run-status)               (apply db:get-run-status dbstruct params))
	   ((set-run-status)               (apply db:set-run-status dbstruct params))
	   ((register-run)                 (apply db:register-run dbstruct params))
	   ((set-tests-state-status)       (apply db:set-tests-state-status dbstruct params))
	   ((get-tests-for-run)            (apply db:get-tests-for-run dbstruct params))
	   ((get-test-id)                  (apply db:get-test-id dbstruct params))
	   ((get-tests-for-runs-mindata)   (apply db:get-tests-for-runs-mindata dbstruct params))
	   ((get-run-name-from-id)         (apply db:get-run-name-from-id dbstruct params))
	   ((delete-run)                   (apply db:delete-run dbstruct params))
	   ((get-runs)                     (apply db:get-runs dbstruct params))
	   ((get-all-run-ids)              (db:get-all-run-ids dbstruct))
	   ((get-prev-run-ids)             (apply db:get-prev-run-ids dbstruct params))
	   ((get-run-ids-matching-target)  (apply db:get-run-ids-matching-target dbstruct params))
	   ((get-runs-by-patt)             (apply db:get-runs-by-patt dbstruct params))
	   ((lock/unlock-run)              (apply db:lock/unlock-run dbstruct params))
	   ((update-run-event_time)        (apply db:update-run-event_time dbstruct params))
	   ((find-and-mark-incomplete)     (apply db:find-and-mark-incomplete dbstruct params))

	   ;; STEPS
	   ((teststep-set-status!)         (apply db:teststep-set-status! dbstruct params))

	   ;; TEST DATA
	   ((test-data-rollup)             (apply db:test-data-rollup dbstruct params))
	   ((csv->test-data)               (apply db:csv->test-data dbstruct params))
	   ((get-steps-data)               (apply db:get-steps-data dbstruct params))

	   ;; MISC
	   ((login)                        (apply db:login dbstruct params))
	   ((general-call)                 (let ((stmtname   (car params))
						 (run-id     (cadr params))
						 (realparams (cddr params)))
					     (db:with-db dbstruct run-id #t ;; these are all for modifying the db
							 (lambda (db)
							   (db:general-call db stmtname realparams)))))
	   ((sync-inmem->db)               (db:sync-touched dbstruct run-id force-sync: #t))
	   ((sdb-qry)                      (apply sdb:qry params))
	   ((ping)                         (current-process-id))

	   ;; TESTMETA
	   ((testmeta-get-record)       (apply db:testmeta-get-record dbstruct params))
	   ((testmeta-add-record)       (apply db:testmeta-add-record dbstruct params))
	   ((testmeta-update-field)     (apply db:testmeta-update-field dbstruct params)))))
    (vector #t res)))
	 ;; NO ELSE - let it return undef
	 ;;(else
	 ;; (list "ERROR" 0))))

;; http-server  send-response
;;                 api:process-request
;;                    db:*
;;
;; NB// Runs on the server as part of the server loop
;;
︙︙

Modified db.scm from [930b139284] to [f9ca78a55d].

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     (string-substitute
      (regexp "=") "_"
      (base64:base64-encode 
       (z3:encode-buffer
	(with-output-to-string
	  (lambda ()(serialize obj)))))
      #t))
    ((zmq nm)(with-output-to-string (lambda ()(serialize obj))))
    (else obj)))

(define (db:string->obj msg #!key (transport 'http))
  (case transport
    ;; ((fs) msg)
    ((http fs)
     (if (string? msg)
	 (with-input-from-string 
	     (z3:decode-buffer
	      (base64:base64-decode
	       (string-substitute 
		(regexp "_") "=" msg #t)))
	   (lambda ()(deserialize)))
	 (begin
	   (debug:print 0 "ERROR: reception failed. Received " msg " but cannot translate it.")
	   #f))) ;; crude reply for when things go awry
    ((zmq nm)(with-input-from-string msg (lambda ()(deserialize))))
    (else msg)))

(define (db:test-set-status-state dbstruct run-id test-id status state msg)
  (let ((dbdat  (db:get-db dbstruct run-id)))
    (if (member state '("LAUNCHED" "REMOTEHOSTSTART"))
	(db:general-call dbdat 'set-test-start-time (list test-id)))
    (if msg








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     (string-substitute
      (regexp "=") "_"
      (base64:base64-encode 
       (z3:encode-buffer
	(with-output-to-string
	  (lambda ()(serialize obj)))))
      #t))
    ((zmq nmsg)(with-output-to-string (lambda ()(serialize obj))))
    (else obj)))

(define (db:string->obj msg #!key (transport 'http))
  (case transport
    ;; ((fs) msg)
    ((http fs)
     (if (string? msg)
	 (with-input-from-string 
	     (z3:decode-buffer
	      (base64:base64-decode
	       (string-substitute 
		(regexp "_") "=" msg #t)))
	   (lambda ()(deserialize)))
	 (begin
	   (debug:print 0 "ERROR: reception failed. Received " msg " but cannot translate it.")
	   #f))) ;; crude reply for when things go awry
    ((zmq nmsg)(with-input-from-string msg (lambda ()(deserialize))))
    (else msg)))

(define (db:test-set-status-state dbstruct run-id test-id status state msg)
  (let ((dbdat  (db:get-db dbstruct run-id)))
    (if (member state '("LAUNCHED" "REMOTEHOSTSTART"))
	(db:general-call dbdat 'set-test-start-time (list test-id)))
    (if msg
︙︙

Modified nmsg-transport.scm from [2f563bf500] to [5a0952db48].

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  (debug:print 2 "Attempting to start the server ...")
  (let* ((start-port      (portlogger:open-run-close portlogger:find-port))
	 (server-thread   (make-thread (lambda ()
					 (nmsg-transport:try-start-server dbstruct run-id start-port server-id))
				       "server thread"))
	 (tdbdat          (tasks:open-db)))
    (thread-start! server-thread)
    (if (nmsg-transport:ping hostn start-port)
	(begin
	  (tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "dbprep")
	  (set! *server-info* (list hostn start-port)) ;; probably not needed anymore?
	  (thread-sleep! 3) ;; give some margin for queries to complete before switching from file based access to server based access
	  (set! *inmemdb*  dbstruct)
	  (tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "running")
	  (thread-start! nmsg-transport:keep-running)


	  (thread-join! server-thread))
	(begin
	  (tasks:server-delete-record (db:delay-if-busy tdbdat) server-id "failed to start, never received server alive signature")
	  (portlogger:open-run-close portlogger:set-failed start-port)
	  (nmsg-transport:run dbstruct hostn run-id server-id)))))

(define (nmsg-transport:try-start-server dbstruct run-id portnum server-id)
  (let ((repsoc (nn-socket 'rep)))
    (nn-bind repsoc (conc "tcp://*:" portnum))
    (let loop ((msg-in (nn-recv repsoc)))
      (cond
       ((equal? msg-in "quit")
	(nn-send repsoc "Ok, quitting"))
       ((and (>= (string-length msg-in) 4)
	     (equal? (substring msg-in 0 4) "ping"))
	(nn-send repsoc (conc (current-process-id)))
	(loop (nn-recv repsoc)))
       (else
	(let* ((dat    (db:string->obj msg-in transport: 'nm))
	       (cmd    (vector-ref dat 0))
	       (params (vector-ref dat 1))
	       (result (api:execute-requests dbstruct cmd params))
	       (newdat (db:obj->string result transport: 'nm)))
	  (nn-send repsoc newdat)
	  (loop (nn-recv repsoc))))))))

;; run nmsg-transport:keep-running in a parallel thread to monitor that the db is being 
;; used and to shutdown after sometime if it is not.
;;
(define (nmsg-transport:keep-running)
  ;; if none running or if > 20 seconds since 
  ;; server last used then start shutdown
  ;; This thread waits for the server to come alive
  (let* ((server-info (let loop ()
			(let ((sdat #f))
			  (mutex-lock! *heartbeat-mutex*)
			  (set! sdat *server-info*)
			  (mutex-unlock! *heartbeat-mutex*)
			  (if sdat sdat
			      (begin
				(debug:print 12 "WARNING: server not started yet, waiting few seconds before trying again")
				(sleep 4)
				(loop))))))
	 (iface       (cadr server-info))
	 (pullport    (caddr server-info))
	 (pubport     (cadddr server-info)) ;; id interface pullport pubport)
	 ;; (nmsg-sockets (nmsg-transport:client-connect iface pullport pubport))
	 (last-access 0))
    (debug:print-info 11 "heartbeat started for nmsg server on " iface " " pullport " " pubport)
    (let loop ((count 0))
      (thread-sleep! 4) ;; no need to do this very often
      ;; NB// sync currently does NOT return queue-length
      ;; GET REAL QUEUE LENGTH FROM THE VARIABLE
      (let ((queue-len 0)) ;; FOR NOW DO NOT DO THIS (cdb:client-call nmsg-sockets 'sync #t 1)))
      ;; (print "Server running, count is " count)
	(if (< count 1) ;; 3x3 = 9 secs aprox
	    (loop (+ count 1)))

	;; NOTE: Get rid of this mechanism! It really is not needed...
	;; (open-run-close tasks:server-update-heartbeat tasks:open-db (car server-info))

	;; (if ;; (or (> numrunning 0) ;; stay alive for two days after last access
	(mutex-lock! *heartbeat-mutex*)
	(set! last-access *last-db-access*)
	(mutex-unlock! *heartbeat-mutex*)
	(if (> (+ last-access
		  ;; (* 50 60 60)    ;; 48 hrs
		  ;; 60              ;; one minute
		  ;; (* 60 60)       ;; one hour
		  (* 45 60)          ;; 45 minutes, until the db deletion bug is fixed.
		  )
	       (current-seconds))
	    (begin
	      (debug:print-info 2 "Server continuing, seconds since last db access: " (- (current-seconds) last-access))
	      (loop 0))
	    (begin
	      (debug:print-info 0 "Starting to shutdown the server.")
	      ;; need to delete only *my* server entry (future use)
	      (set! *time-to-exit* #t)
	      (open-run-close tasks:server-deregister-self tasks:open-db (get-host-name))
	      (thread-sleep! 1)
	      (debug:print-info 0 "Max cached queries was " *max-cache-size*)
	      (debug:print-info 0 "Server shutdown complete. Exiting")
	      (exit)))))))

;; all routes though here end in exit ...
;;
(define (nmsg-transport:launch run-id)
  (let* ((tdbdat   (tasks:open-db))
	 (dbstruct (db:setup run-id))
	 (hostn    (or (args:get-arg "-server") "-")))








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  (debug:print 2 "Attempting to start the server ...")
  (let* ((start-port      (portlogger:open-run-close portlogger:find-port))
	 (server-thread   (make-thread (lambda ()
					 (nmsg-transport:try-start-server dbstruct run-id start-port server-id))
				       "server thread"))
	 (tdbdat          (tasks:open-db)))
    (thread-start! server-thread)
    (if (nmsg-transport:ping hostn start-port timeout: 2 expected-key: (current-process-id))
	(begin
	  (tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "dbprep")
	  (set! *server-info* (list hostn start-port)) ;; probably not needed anymore? currently used by keep-running
	  (thread-sleep! 3) ;; give some margin for queries to complete before switching from file based access to server based access
	  (set! *inmemdb*  dbstruct)
	  (tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "running")
	  (thread-start! (make-thread
			  (lambda ()(nmsg-transport:keep-running server-id))
			  "keep running"))
	  (thread-join! server-thread))
	(begin
	  (tasks:server-delete-record (db:delay-if-busy tdbdat) server-id "failed to start, never received server alive signature")
	  (portlogger:open-run-close portlogger:set-failed start-port)
	  (nmsg-transport:run dbstruct hostn run-id server-id)))))

(define (nmsg-transport:try-start-server dbstruct run-id portnum server-id)
  (let ((repsoc (nn-socket 'rep)))
    (nn-bind repsoc (conc "tcp://*:" portnum))
    (let loop ((msg-in (nn-recv repsoc)))
      (cond
       ((equal? msg-in "quit")
	(nn-send repsoc "Ok, quitting"))
       ((and (>= (string-length msg-in) 4)
	     (equal? (substring msg-in 0 4) "ping"))
	(nn-send repsoc (conc (current-process-id)))
	(loop (nn-recv repsoc)))
       (else
	(let* ((dat    (db:string->obj msg-in transport: 'nmsg))
	       (cmd    (vector-ref dat 0))
	       (params (vector-ref dat 1))
	       (result (api:execute-requests dbstruct cmd params))
	       (newdat (db:obj->string result transport: 'nmsg)))
	  (nn-send repsoc newdat)
	  (loop (nn-recv repsoc))))))))




























































;; all routes though here end in exit ...
;;
(define (nmsg-transport:launch run-id)
  (let* ((tdbdat   (tasks:open-db))
	 (dbstruct (db:setup run-id))
	 (hostn    (or (args:get-arg "-server") "-")))
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;;======================================================================

;; ping the server at host:port
;;   return the open socket if successful (return-socket == #t)
;;   expect the key expected-key returned in payload
;;   send our-key or #f as payload
;;
(define (nmsg-transport:ping hostn port #!key (return-socket #t)(expected-key #f)(our-key #f))
  ;; send a random number along with pid and check that we get it back
  (let* ((req     (nn-socket 'req))
	 (host    (if (or (not hostn)
			  (equal? hostn "-")) ;; use localhost
		      (get-host-name)
		      hostn))
	 (success #f)
	 (keepwaiting #t)
	 (dat     (db:obj->string (vector "ping" our-key) transport: 'nm))
	 (ping    (make-thread
		   (lambda ()
		     (nn-send req dat)
		     (let* ((result  (nn-recv req))
			    (key     (vector-ref (db:string->obj result transport: 'nm) 1)))
		       (if (or (not expect-key) ;; just getting a reply is good enough then
			       (equal? (conc (current-process-id)) expected-key)) 
			   (begin
			     ;; (print "ping, success: received \"" result "\"")
			     (set! success #t))
			   (begin
			     ;; (print "ping, failed: received key \"" result "\"")
			     (set! keepwaiting #f)
			     (set! success #f)))))
		   "ping"))
	 (timeout (make-thread (lambda ()
				 (let loop ((count 0))
				   (thread-sleep! 1)
				   (print "still waiting after count seconds...")
				   (if (and keepwaiting (< count 10))
				       (loop (+ count 1))))
				 (if keepwaiting
				     (begin
				       (print "timeout waiting for ping")
				       (thread-terminate! ping))))
			       "timeout")))
    (nn-connect req (conc "tcp://" host ":" port))
    (handle-exceptions
     exn
     (begin
       (print-call-chain)
       (print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
       (print "exn=" (condition->list exn))
       (print "ping failed to connect to " host ":" port))
     (thread-start! timeout)
     (thread-start! ping)
     (thread-join! ping)
     (if success (thread-terminate! timeout)))
    (if return-socket
	(if success req #f)
	(begin








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;;======================================================================

;; ping the server at host:port
;;   return the open socket if successful (return-socket == #t)
;;   expect the key expected-key returned in payload
;;   send our-key or #f as payload
;;
(define (nmsg-transport:ping hostn port #!key (timeout 3)(return-socket #t)(expected-key #f)(our-key #f))
  ;; send a random number along with pid and check that we get it back
  (let* ((req     (nn-socket 'req))
	 (host    (if (or (not hostn)
			  (equal? hostn "-")) ;; use localhost
		      (get-host-name)
		      hostn))
	 (success #f)
	 (keepwaiting #t)
	 (dat     (db:obj->string (vector "ping" our-key) transport: 'nmsg))
	 (ping    (make-thread
		   (lambda ()
		     (nn-send req dat)
		     (let* ((result  (nn-recv req))
			    (key     (vector-ref (db:string->obj result transport: 'nmsg) 1)))
		       (if (or (not expected-key) ;; just getting a reply is good enough then
			       (equal? key expected-key)) 
			   (begin
			     ;; (print "ping, success: received \"" result "\"")
			     (set! success #t))
			   (begin
			     ;; (print "ping, failed: received key \"" result "\"")
			     (set! keepwaiting #f)
			     (set! success #f)))))
		   "ping"))
	 (timeout (make-thread (lambda ()
				 (let loop ((count 0))
				   (thread-sleep! 1)
				   (print "still waiting after count seconds...")
				   (if (and keepwaiting (< count timeout)) ;; yes, this is very aproximate
				       (loop (+ count 1))))
				 (if keepwaiting
				     (begin
				       (print "timeout waiting for ping")
				       (thread-terminate! ping))))
			       "timeout")))
    (nn-connect req (conc "tcp://" host ":" port))
    (handle-exceptions
     exn
     (begin
       ;; (print-call-chain)
       ;; (print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
       ;; (print "exn=" (condition->list exn))
       (debug:print-info 1 "ping failed to connect to " host ":" port))
     (thread-start! timeout)
     (thread-start! ping)
     (thread-join! ping)
     (if success (thread-terminate! timeout)))
    (if return-socket
	(if success req #f)
	(begin
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	  (debug:print-info 2 "Failed to login or connect to " conurl)
	  (set! *runremote* #f)
	  #f))))

;; run nmsg-transport:keep-running in a parallel thread to monitor that the db is being 
;; used and to shutdown after sometime if it is not.
;;
(define (nmsg-transport:keep-running)
  ;; if none running or if > 20 seconds since 
  ;; server last used then start shutdown
  ;; This thread waits for the server to come alive
  (let* ((server-info (let loop ()
                        (let ((sdat #f))
                          (mutex-lock! *heartbeat-mutex*)
                          (set! sdat *runremote*)
                          (mutex-unlock! *heartbeat-mutex*)
                          (if sdat sdat
                              (begin



                                (sleep 4)
                                (loop))))))
         (iface       (car server-info))
         (port        (cadr server-info))
         (last-access 0)
	 (tdb         (tasks:open-db))
	 (spid        (tasks:server-get-server-id tdb #f iface port #f)))
    (print "Keep-running got server pid " spid ", using iface " iface " and port " port)
    (let loop ((count 0))
      (thread-sleep! 4) ;; no need to do this very often
      ;; NB// sync currently does NOT return queue-length
      (let () ;; (queue-len (cdb:client-call server-info 'sync #t 1)))
      ;; (print "Server running, count is " count)
        (if (< count 1) ;; 3x3 = 9 secs aprox
            (loop (+ count 1)))
        
        ;; NOTE: Get rid of this mechanism! It really is not needed...
        (tasks:server-update-heartbeat tdb spid)
      
        ;; (if ;; (or (> numrunning 0) ;; stay alive for two days after last access
        (mutex-lock! *heartbeat-mutex*)
        (set! last-access *last-db-access*)
        (mutex-unlock! *heartbeat-mutex*)
        (if (> (+ last-access
                  ;; (* 50 60 60)    ;; 48 hrs
                  ;; 60              ;; one minute
                  ;; (* 60 60)       ;; one hour
                  (* 45 60)          ;; 45 minutes, until the db deletion bug is fixed.
                  )
               (current-seconds))
            (begin
              (debug:print-info 2 "Server continuing, seconds since last db access: " (- (current-seconds) last-access))
              (loop 0))
            (begin
              (debug:print-info 0 "Starting to shutdown the server.")
              ;; need to delete only *my* server entry (future use)
              (set! *time-to-exit* #t)
              (tasks:server-deregister-self tdb (get-host-name))
              (thread-sleep! 1)
              (debug:print-info 0 "Max cached queries was " *max-cache-size*)
              (debug:print-info 0 "Server shutdown complete. Exiting")

              (exit)))))))


(define (nmsg-transport:client-signal-handler signum)
  (handle-exceptions
   exn
   (debug:print " ... exiting ...")
   (let ((th1 (make-thread (lambda ()








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	  (debug:print-info 2 "Failed to login or connect to " conurl)
	  (set! *runremote* #f)
	  #f))))

;; run nmsg-transport:keep-running in a parallel thread to monitor that the db is being 
;; used and to shutdown after sometime if it is not.
;;
(define (nmsg-transport:keep-running server-id)
  ;; if none running or if > 20 seconds since 
  ;; server last used then start shutdown
  ;; This thread waits for the server to come alive
  (let* ((server-info (let loop ()
                        (let ((sdat #f))
                          (mutex-lock! *heartbeat-mutex*)
                          (set! sdat *server-info*)
                          (mutex-unlock! *heartbeat-mutex*)
                          (if sdat 
			      (begin
				(debug:print-info 0 "keep-running got sdat=" sdat)
				sdat)
                              (begin
                                (thread-sleep! 0.5)
                                (loop))))))
         (iface       (car server-info))
         (port        (cadr server-info))
         (last-access 0)
	 (tdbdat      (tasks:open-db)))

    (print "Keep-running got server pid " server-id ", using iface " iface " and port " port)
    (let loop ((count 0))
      (thread-sleep! 4) ;; no need to do this very often
      ;; NB// sync currently does NOT return queue-length
      (let () ;; (queue-len (cdb:client-call server-info 'sync #t 1)))
      ;; (print "Server running, count is " count)
        (if (< count 1) ;; 3x3 = 9 secs aprox
            (loop (+ count 1)))
        



        ;; (if ;; (or (> numrunning 0) ;; stay alive for two days after last access
        (mutex-lock! *heartbeat-mutex*)
        (set! last-access *last-db-access*)
        (mutex-unlock! *heartbeat-mutex*)
        (if (> (+ last-access
                  ;; (* 50 60 60)    ;; 48 hrs
                  ;; 60              ;; one minute
                  ;; (* 60 60)       ;; one hour
                  (* 45 60)          ;; 45 minutes, until the db deletion bug is fixed.
                  )
               (current-seconds))
            (begin
              (debug:print-info 0 "Server continuing, seconds since last db access: " (- (current-seconds) last-access))
              (loop 0))
            (begin
              (debug:print-info 0 "Starting to shutdown the server.")

              (set! *time-to-exit* #t)
              (tasks:server-delete-record (db:delay-if-busy tdbdat) server-id " http-transport:keep-running")


              (debug:print-info 0 "Server shutdown complete. Exiting")
              ;; (exit)
	      ))))))


(define (nmsg-transport:client-signal-handler signum)
  (handle-exceptions
   exn
   (debug:print " ... exiting ...")
   (let ((th1 (make-thread (lambda ()
︙︙

Modified rmt.scm from [a7d45cc611] to [db091f3ce4].

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  (let* ((run-id          (if rid rid 0))
	 (connection-info (rmt:get-connection-info run-id))
	 (jparams         (db:obj->string params)))
    (if connection-info
	;; use the server if have connection info
	(let* ((dat     (case *transport-type*
			  ((http)(http-transport:client-api-send-receive run-id connection-info cmd jparams))
			  ((nm)  (nm-transport:client-api-send-receive   run-id connection-info cmd jparams))
			  (else  (exit))))
	       (res     (if (vector? dat) (vector-ref dat 1) #f))
	       (success (if (vector? dat) (vector-ref dat 0) #f)))
	  (http-transport:server-dat-update-last-access connection-info)
	  (if success
	      (db:string->obj res)
	      (begin ;; let ((new-connection-info (client:setup run-id)))








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  (let* ((run-id          (if rid rid 0))
	 (connection-info (rmt:get-connection-info run-id))
	 (jparams         (db:obj->string params)))
    (if connection-info
	;; use the server if have connection info
	(let* ((dat     (case *transport-type*
			  ((http)(http-transport:client-api-send-receive run-id connection-info cmd jparams))
			  ((nmsg)(nmsg-transport:client-api-send-receive   run-id connection-info cmd jparams))
			  (else  (exit))))
	       (res     (if (vector? dat) (vector-ref dat 1) #f))
	       (success (if (vector? dat) (vector-ref dat 0) #f)))
	  (http-transport:server-dat-update-last-access connection-info)
	  (if success
	      (db:string->obj res)
	      (begin ;; let ((new-connection-info (client:setup run-id)))
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